Understanding Silverado HD Engine Options: Duramax Diesel vs. Gas
The 2026 Chevrolet Silverado HD offers two engines. Choosing between them is the biggest decision you will make. One is the standard 6.6L V8 gas engine. The other is the available Duramax 6.6L Turbo-Diesel V8. Both pair with a 10-speed Allison automatic transmission. Both are offered across the entire lineup. But they deliver capability in very different ways. Here is how the two compare, and how to tell which one fits the work you actually do.
2026 Silverado HD Engine Options at a Glance
Both engines are built around the same 10-speed Allison automatic transmission. The difference is in how much torque each one makes, and how much trailer each one can move. Figures below are published by Chevrolet for the 2026 Silverado HD.
| 6.6L V8 Gas | Duramax 6.6L Turbo-Diesel V8 | |
|---|---|---|
| Availability | Standard on every model | Available on every model |
| Horsepower | 401 hp | 470 hp |
| Torque | 464 lb-ft | 975 lb-ft |
| Transmission | 10-speed Allison automatic | 10-speed Allison automatic |
| Max available trailering weight | 19,080 lbs | 36,000 lbs |
Maximum towing and payload capacity figures are based on properly equipped vehicles and vary by configuration. Do not exceed any weight rating. See your owner’s manual and the vehicle’s door-jamb label for specific capacities.
The 6.6L V8 Gas Engine
The 6.6L V8 is the standard powertrain on every 2026 Silverado HD. That runs from Work Truck all the way up through High Country. It produces 401 horsepower and 464 lb-ft of torque through a 10-speed Allison automatic transmission. Properly equipped, it tows up to 19,080 pounds.
For a lot of buyers across Riverside, San Bernardino, and Fontana, that is the right answer. Nineteen thousand pounds covers a loaded equipment trailer, a mid-size fifth-wheel, or machinery on a gooseneck. You get there without stepping up to the optional diesel. If your truck spends most of its week running job sites, and the heavy pulls are occasional rather than constant, the gas V8 is a straightforward fit.
The Available Duramax 6.6L Turbo-Diesel V8
Every 2026 Silverado HD model can be ordered with the Duramax 6.6L Turbo-Diesel V8. It is not restricted to upper trims. The Duramax produces 470 horsepower and 975 lb-ft of torque, also through a 10-speed Allison automatic. That raises maximum available trailering weight to 36,000 pounds.
The torque figure is what separates the two engines in practice. Torque gets a heavy trailer moving, and it holds speed under load. So drivers who tow near the top of the truck’s rating gain real margin from the diesel. The same goes for anyone who tows heavy most days rather than some days. Chevrolet rates every Silverado HD Dually paired with the Duramax at over 30,000 pounds. That is one reason the engine is a common choice among the commercial and fleet buyers shopping our Chevrolet commercial lineup.
Silverado 2500 HD vs. 3500 HD: How Much Can Each Tow?
The 36,000-pound headline belongs to the Silverado 3500 HD in a properly equipped dual-rear-wheel configuration. Most shoppers walking our lot in Riverside are cross-shopping the 2500 HD. Here is the number that actually applies to them, per Chevrolet’s published maximum trailering weights.
| Model | Max available trailering weight |
|---|---|
| Silverado 2500 HD | 22,420 lbs |
| Silverado 2500 HD Crew Cab | 22,070 lbs (segment-leading) |
| Silverado 3500 HD | 36,000 lbs |
Maximum towing and payload capacity figures are based on properly equipped vehicles and vary by configuration. Do not exceed any weight rating. See your owner’s manual and the vehicle’s door-jamb label for specific capacities.
Shopping a Silverado 2500 HD Crew Cab because you need the back seat? Then 22,070 pounds is your ceiling, regardless of which engine you choose. That still clears most fifth-wheel and gooseneck trailers in this class. If you need more than that, look at the Silverado 3500 HD instead.
Which Silverado HD Engine Is Right for You?
The decision comes down to how often you tow, and how close to the truck’s limit you run when you do.
| Choose the 6.6L V8 gas engine | Choose the Duramax Turbo-Diesel V8 | |
|---|---|---|
| How often you tow | Occasionally | On a regular schedule |
| Typical trailer weight | Comfortably under 19,000 lbs | Near the top of the truck’s rating |
| Best-suited model | Silverado 2500 HD | Silverado 2500 HD or 3500 HD |
| Typical use | Job sites and weekend towing | Commercial and fleet work |
| Where your budget goes | Trim, cab configuration, equipment | Torque and towing margin |
Drivers in Ontario, Corona, and Eastvale who run equipment daily tend to land on the diesel.
Trailering Technology on the Silverado HD
Whichever engine you choose, Silverado HD offers 8 available cameras with up to 14 views plus a set of trailering aids:
- Hitch View — a close-up view of the hitch for easier alignment when connecting a trailer.
- Transparent Trailer View — lets you see past a connected trailer, including with a fifth-wheel or gooseneck hitch.
- Bed View — shows the cargo bed to help with fifth-wheel or gooseneck hitching.
- In-Vehicle Trailering App — stores custom trailer profiles and step-by-step pre-departure checklists.
- Trailer Side Blind Zone Alert — extends blind-zone warnings along the length of your trailer.
Driver-assistance and advanced safety systems are supplemental aids and are not substitutes for safe and attentive driving. Availability, operation, and effectiveness vary by trim and equipment and depend on factors including road, weather, traffic, and vehicle condition. Always keep your hands on the wheel and your eyes on the road. See your owner’s manual for system limitations and details.
Common Questions About Silverado HD Engines
Can you order a diesel engine on any Chevy Silverado HD?
Yes. Every 2026 Silverado HD model can be ordered with the available Duramax 6.6L Turbo-Diesel V8, which delivers 470 horsepower and 975 lb-ft of torque.
How much can a 2026 Chevy Silverado HD tow?
Maximum available trailering weight is 36,000 pounds for the Silverado 3500 HD and 22,420 pounds for the Silverado 2500 HD, when properly equipped.
Maximum towing and payload capacity figures are based on properly equipped vehicles and vary by configuration. Do not exceed any weight rating. See your owner’s manual and the vehicle’s door-jamb label for specific capacities.
What transmission does the Silverado HD use?
Both the 6.6L V8 gas engine and the Duramax 6.6L Turbo-Diesel V8 use a 10-speed Allison automatic transmission.
What does HD mean on the Chevy Silverado?
HD stands for heavy-duty. It designates the Silverado 2500 HD and 3500 HD, which are built for higher towing and payload capability than the light-duty Silverado 1500.
See the Silverado HD at Riverside Chevrolet
The fastest way to settle the gas-versus-diesel question is to drive both. Chevrolet Silverado HD has been named America’s Most Awarded Heavy Duty Truck for Dependability by J.D. Power, 2016–2025. But a dependability ranking will not tell you which engine suits your trailer. Our team can match engine, trim, cab, and bed against the load you actually pull. Visit us at 8200 Auto Center Drive in Riverside, or call (951) 643-7003.
Disclaimers
Maximum towing and payload capacity figures are based on properly equipped vehicles and vary by configuration. Do not exceed any weight rating. See your owner’s manual and the vehicle’s door-jamb label for specific capacities.
Driver-assistance and advanced safety systems are supplemental aids and are not substitutes for safe and attentive driving. Availability, operation, and effectiveness vary by trim and equipment and depend on factors including road, weather, traffic, and vehicle condition. Always keep your hands on the wheel and your eyes on the road. See your owner’s manual for system limitations and details.